ssl-cert-check-cli

Check SSL certificate details and expiry for any domain from the command line.

Installation

npm install -g ssl-cert-check-cli

Usage

# Check a single domain
ssl-check example.com

# Check multiple domains
ssl-check example.com google.com github.com

# JSON output
ssl-check --json example.com

# Custom port and timeout
ssl-check --port 8443 --timeout 5000 example.com

# Verify full certificate chain
ssl-check --check-chain example.com

Options

| Option | Description | Default | |---|---|---| | -p, --port <number> | Port to connect to | 443 | | -t, --timeout <ms> | Connection timeout in milliseconds | 10000 | | -j, --json | Output results as JSON | false | | -c, --check-chain | Verify the full certificate chain | false |

Output

For each domain the tool displays:

• Subject and Issuer (CN, O)
• Valid From / To dates
• Days until expiry (color-coded: green >30d, yellow 7-30d, red <7d or expired)
• Serial number and SHA-256 fingerprint
• SAN domains (Subject Alternative Names)
• TLS protocol version

When checking multiple domains a summary table is printed at the end.

Exit Codes

• 0 - All certificates are valid
• 1 - One or more certificates are expired or had connection errors

License

MIT